/// <summary>
/// Calls Rule's Parse and adds as child result if succesful.
/// </summary>
/// <param name="token"></param>
/// <returns></returns>
public TokenParseResult ParseRule(Token token, ParserSettings settings)
{
TokenParseResult result = Rule.Parse(token, settings);
if (result.IsSuccesful)
{
SyntaxNode parentNode = new SyntaxNode(Source, token);
parentNode.Add(result.Node);
result.Node = parentNode;
}
return(result);
}
private static SyntaxNode FactoryCreateColumnOrExpression(ParsingContext xoContext)
{
SyntaxKind eNextTokenKind = xoContext.List.Peek().ExpectedType;
SyntaxNode oReturnNode;
// Is any identifier or Expression (function/literal)
if (SyntaxKindFacts.IsFunction(eNextTokenKind))
{
// COUNT (*)
oReturnNode = FactoryCreateColumnFunction(xoContext);
}
else if (eNextTokenKind == SyntaxKind.OpenParenthesisToken)
{
oReturnNode = FactoryInterpretOpenParenthesisToken(xoContext);
}
else if (
SyntaxKindFacts.IsIdentifier(eNextTokenKind) ||
SyntaxKindFacts.IsLiteral(eNextTokenKind))
{
// Only Column List Nodes can create an Alias
Boolean bIsAliasNeeded = xoContext.CurrentNode.ExpectedType == SyntaxKind.ColumnListNode &&
eNextTokenKind != SyntaxKind.StarToken; // Stars do not get alias'
oReturnNode = FactoryCreateColumn(xoContext, bIsAliasNeeded);
}
else if (eNextTokenKind == SyntaxKind.CaseKeyword)
{
if (xoContext.CurrentNode.ExpectedType == SyntaxKind.ColumnListNode)
{
return(new Symbol(
xoContext.List.Peek(),
NodeStrategyFactory.FactoryCreateStrategy(xoContext.List.Pop().ExpectedType), -1));
}
else
{
return(new SyntaxNode(
xoContext.List.Peek(),
NodeStrategyFactory.FactoryCreateStrategy(xoContext.List.Pop().ExpectedType)));
}
}
else
{
oReturnNode = new SyntaxLeaf(xoContext.List.Pop());
}
// If we have a trailing || and we arent already using a bar bar
if (xoContext.CurrentNode.ExpectedType != SyntaxKind.BarBarToken &&
xoContext.List.Peek().ExpectedType == SyntaxKind.BarBarToken)
{
// Create a new bar bar node (to hold the children)
SyntaxNode oBarNode = new SyntaxNode(xoContext.List.Pop());
// Add the child
oBarNode.Add(oReturnNode);
// return this collection
return(oBarNode);
}
// Valid case, no fixing necessary
else
{
return(oReturnNode);
}
}
